1.       二極體本體的兩個PAD都有銲錫，PCB PAD【無銲錫的PAD】也可以用烙鐵加上錫，應該可以排除被污染.

2.       如果是鋼網孔被堵住，那二極體PAD上的錫是哪裡來的？【從狀態上看沒有被烙鐵動過】

3.       零件是平貼PCB板的【零件沒有立碑】，不仔細看的話，看不出來異常.

[cid:[log in to unmask]]

________________________________
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Wednesday, May 15, 2013 4:32 PM
To: Tongkan(b 童刊); [log in to unmask]
Subject: 回覆: 請教：無鉛噴錫板錫膏製程銲錫不良

是不是電阻電極污染了？

Best Regards

寄件者: TGAsia [mailto:[log in to unmask]] 代理 Tongkan(b 童刊)
寄件日期: 2013年5月15日星期三 16:21
收件者: [log in to unmask]
主旨: [TGAsia] 請教：無鉛噴錫板錫膏製程銲錫不良

各位：
請各位大俠幫忙分析一下，如下的不良圖片，貼片二極體一端PAD吃錫良好，另一端PAD沒有銲錫【PCB板沒有動過烙鐵的痕跡，PAD很光滑】，主要是什麽會產生這種不良？
說明：零件撥動的時候斷掉了，零件另一端PAD底部及側面有銲錫【沒有發行有動烙鐵的痕跡】

[cid:[log in to unmask]]
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TGAsia是一个为业界同仁提供技术交流的平台。您可以在论坛上提出技术问题，交流行业经验，寻找供应商等。请勿发送任何招聘，广告信息。（注：对于寻求供应商的邮件，请勿回复[log in to unmask],请私下和发件人联系）。如您需要退出该邮件论坛，请直接发送邮件至 [log in to unmask]<mailto:[log in to unmask]> ,谢谢。
________________________________
Tongkan(b 童刊)
D.生技課 - 康舒電子(東莞)有限公司
- - -
Telephone: 36971 / Fax: / Mobile:

The content of this e-mail (including any attachments) is strictly confidential and may be commercially sensitive. If you are not, or believe you may not be, the intended recipient, please advise the sender immediately by return e-mail, delete this e-mail and destroy any copies.

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